Its technique of kicking while spinning is a remarkable mix of both offense and defense. Hitmontop travel faster spinning than they do walking.
(From Bulbapedia) Hitmontop is a vaguely humanoid Pokémon capable of spinning on its head. Its main body is spherical and mostly blue with a brown triangular patch on its chest. It has short legs with white bands near the hands and feet. The feet are large, blue and have a circular brown pad on the underside. It has a skinny brown tail that ends with a blue sphere with a spike on it. Its head is round and brown with flat, curved extensions on either side and a single spike on top. It has a beady, black eyes and spherical hands with no digits. Hitmontop is a male-only species with no female counterpart.
Hitmontop moves more quickly by spinning on the spike on its head than it does by walking normally. Capable of spinning at high speeds, it may bore into the ground similar to a drill. While spinning, Hitmontop delivers smooth, graceful kicks such as its former signature move, Triple Kick. As an urban species, it is often found in towns and cities.
(From Bulbapedia) Hitmontop is based on a top and a practitioner of capoeira. The fact that Tyrogue's Attack and Defense must be equal in order for it to evolve into Hitmontop is akin to how a top must be in equilibrium to remain upright.
(From Bulbapedia) Hitmontop is a combination of hit, monster, and top (a reference to spinning tops and how it fights, by spinning on its head). The name is also related to Hitmonlee and Hitmonchan, both of which have been parallel evolutions to it since Generation II.